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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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UNLOCKPT(3) Linux Programmer's Manual UNLOCKPT(3)
unlockpt - unlock a pseudoterminal master/slave pair
#define _XOPEN_SOURCE
#include <stdlib.h>
int unlockpt(int fd);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
unlockpt():
Since glibc 2.24:
_XOPEN_SOURCE >= 500 ||
(_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
Glibc 2.23 and earlier:
_XOPEN_SOURCE
The unlockpt() function unlocks the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by the
file descriptor fd.
unlockpt() should be called before opening the slave side of a
pseudoterminal.
When successful, unlockpt() returns 0. Otherwise, it returns -1
and sets errno appropriately.
EBADF The fd argument is not a file descriptor open for writing.
EINVAL The fd argument is not associated with a master
pseudoterminal.
unlockpt() is provided in glibc since version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├───────────┼───────────────┼─────────┤
│unlockpt() │ Thread safety │ MT-Safe │
└───────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008.
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
This page is part of release 5.10 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2017-07-13 UNLOCKPT(3)
Pages that refer to this page: ioctl_tty(2), getpt(3), grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
Copyright and license for this manual page
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